How do I whitelist my own domain so email send inter domain will not be filtered

simply go to your cPanel, under MailScanner, click [email Black/whitelist setting], then fill-in *@yourdomain.com in the whitelist and then click on the [change] button, then click [back to the mailscanner configuration] and then click on [change] button once again to retart the mailscanner. You are done. Note: changes will take up to 10 minutes to take effect.